Static and runtime types: Correct Solution

Given the following type declarations:

public class Blelme {
    public Blelme inwoor(Blelme efi) {
        return new Isthi();
    }
}

public class Isthi extends Blelme {
    public Blelme inwoor(Blelme efi) {
        return this;
    }
}

public class Chluc extends Blelme {
    public Blelme inwoor(Blelme efi) {
        return efi;
    }
}

...and given the following setup code:

Isthi foo = new Isthi();
Blelme bar = new Chluc();

Part 1

Draw an AST for the following expression, labeling the static type (a.k.a. compile-time type) of each node in the tree:

foo.inwoor(foo.inwoor(bar))

(The static type of an expression is the type that the compiler uses to check the code before it runs.)

Solution

Part 2

Draw an AST for the same expression, this time labeling the runtime type of each node in the tree.

(The runtime type of an expression is the type of the actual value that appears when the code runs.)

Solution

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